```js
// .storybook/preview.js
import { ThemeProvider } from "vue-styled-components";

const theme = {
  primary: 'palevioletred',
  secondary: 'papayawhip',
  tertiary: 'lavenderblush'
}

export const decorators = [
  (story) => ({
    components: { story, ThemeProvider },
    data: () => ({ theme }),
    template: '<theme-provider :theme="theme"><story/> </theme-provider>'
  })
];
```